ISO 



INSECTS OF SAMOA. 



both above and below at tip of front tibiae, and above at tip of four posterior 

 tibiae ; three equally spaced, very short but distinct, anteroventral bristles on 

 middle tibiae, and a row of fine, bristly hairs anteroventrally on hind tibiae, 

 almost hidden in longer pubescence there. 



Wings slightly brownish, veins dark except at extreme base of wing. 

 Stigma very distinct, somewhat quadrate, rather longer than deep, and not 

 quite extending downwards to radial vein ; stigma beginning at end of sub- 

 costal vein and ending farther than its own length from end of radial vein. 

 First section of discal vein rather longer than next, which forms upper margin 

 of discal cell. Middle cross-vein exceedingly close to pointed base of discal 

 cell. Third posterior cell somewhat narrowed towards its end, omng to the 

 curve of faint anal vein. End of discal cell much more than length of its 

 terminal cross-vein from end of fifth vein. Halteres black, with yellow base 

 to stem. 



$. Very similar in all respects to Abdomen ending in a pair of short, 

 flattened, pubescent lamellae, looking like another short, narrow segment. 

 Length about 2-5 mm. 

 Upolu : Vailima, 3 1 26.iii.1925. 



The differences between this species and the Fijian Syneches pullus Bezzi 

 {Dipt. Bmchyc. & Athene, of the Fiji Is., p. 54, fig. 17, 1928) are greater than 

 the respective figures would seem to indicate. S. pullus has the upper part of 

 eyes flattened and the facets on the flattened part very large — very much larger 

 than those below. 



The anteroventral bristles on the hind femora are more spinose, and just 

 behind these bristles (rather more beneath the femora) there is a second row of 

 short spines, which is completely absent in S. alienus. Bezzi describes the 

 thorax of S. pullus as " quite bare " ; this is not entirely correct, for there are 

 a few tiny hairs as indicated in the figure ; but in S. alienus the hairs are 

 conspicuous. 



2. Syneches devius, sp. n. 



Very much like S. alienus, but differing in colour of legs, shape of ptero- 

 stigma, and length of pubescence on thorax and legs. 



Eye-facets slightly larger, but, as in S. alienus, no sharp division between 

 larger and smaller facets, while latter are confined to posterior eye-margin and 

 extreme lower part of eye. 



